I noticed there are three pins on board for fan in this card:
http://www.amiga-hardware.com/download_photos/gvpgforce040_2_big.jpg
is third pin unused? can I safely connect modern fan with its third, yellow, wire?
or should it be cut?
Never! cut the yellow wire! It's always the red one!... Or is it the blue one....?
Chick, chick, BOOM!
But seriously that looks just like my GVP040. I replaced the original with the same type of bronze coloured aluminium heatsink and slimline fan. Freaky...
I don't think there is a speed signal on these cards. I'd remove it, if the fan operates without it.